I am building two semi detached two story residences. My architect has designed a concrete tall wall. (party wall). I haven't contacted a contractor yet to build this tall wall and have only seen wood frame built in the past. My question is, how do they build the concrete tall wall, do they form it up floor by floor or do they build the whole thing ahead of time before the remainder of the floors are built??
It depends on the height of the wall. Concrete exerts a lot of hydrostatic pressure on the forms, they bulge out more the further up you go. If your contractor is using formwork with a high pressure rating they can pour the entire wall at once. But if they use typical formwork it will have a pressure rating of about 1500 psf. and they can only pour about 10 foot at a time. It may be more cost effective to have it poured in sections versus going for one continuous run. I hope I was able to help, thanks for using Just Answer!